5.
    发明专利
    失效

    公开(公告)号:JPH0615610B2

    公开(公告)日:1994-03-02

    申请号:JP8723986

    申请日:1986-04-17

    Applicant: BASF AG

    Abstract: The content of cyclic oligomeric ethers in polytetramethylene ether glycols or polyoxybutylene polyoxyalkylene glycols is reduced by a process in which a polytetramethylene ether glycol or polyoxybutylene polyoxyalkylene glycol which contains the said ethers and has a mean molecular weight of from 200 to 450 is mixed with a mixture of water and a hydrocarbon, and, after phase separation, the purified polytetramethylene ether glycol or polyoxybutylene polyoxyalkylene glycol is isolated from the aqueous phase.

Patent Agency Ranking